﻿<p>The <em>IfcAnnotationFillArea</em> defines an area by a definite
<em>OuterBoundary</em>, that might include <em>InnerBoundaries</em>. The areas
defined by the <em>InnerBoundaries</em> are excluded from applying the fill
area style. The <em>InnerBoundaries</em> shall not intersect with the
<em>OuterBoundary</em> nor being outside of the <em>OuterBoundary</em>.</p>
<p>The fill area style that is applied to the <em>IfcAnnotationFillArea</em> is
declared using the <em>IfcFillAreaStyle</em>, associated to the area by an
<em>IfcStyledItem</em>. Applicable fill area styles are a solid color, a
hatching, tiles, or a combination of those styles.</p>
<blockquote class="extDef">NOTE&nbsp; Definition according to ISO 10303-46:<br>
An annotation fill area is a set of curves that may be filled with hatching,
colour or tiling. The annotation fill are is described by boundaries which
consist of non-intersecting, non-self-intersecting closed curves. These curves
form the boundary of planar areas to be filled according to the style for the
annotation fill area.</blockquote>
<p>Figure 2 illustrates annotation fill area.</p>
<table>
<tr>
<td>&nbsp; &nbsp; <img src="../../../figures/ifcannotationfillarea_fig1.png" alt=
"annotation fill area" border="0"></td>
</tr>
<tr>
<td>
<p class="figure">Figure 2 &mdash; Annotation fill area</p>
</td>
</tr>
</table>
<blockquote class="note">NOTE&nbsp; Entity adapted from
<strong>annotation_fill_area</strong> defined in ISO10303-46</blockquote>
<blockquote class="history">HISTORY&nbsp; New entity in IFC2x2.</blockquote>
<blockquote class="change-ifc2x3">IFC2x3 CHANGE&nbsp; The two attributes
<em>OuterBoundary</em> and <em>InnerBoundaries</em> are added and replace the
previous single boundary.</blockquote>
<p class="spec-head">Informal Propositions:</p>
<ol>
<li>Any curve that describes an inner boundary shall not intersect with, nor
include, another curve defining an inner boundary.</li>
<li>The curve defining the outer boundary shall not intersect with any curve
defining an inner boundary, nor shall it be surrounded by a curve defining an
inner boundary.</li>
</ol>